Oxygen Evolution on Nickel Oxide Electrodes

The anodic oxygen evolution reaction on Teflon‐bonded and Li‐doped in solution was studied by potentiostatic and galvanostatic techniques as a function of hydroxyl ion concentration, and the kinetic equations were derived. It was shown that the rate‐determining step (rds) for at current densities of 100–1000 mA‐cm −2 is , and the Tafel slope is approximately 118 mV/decade at 25°C. The rds for Li‐doped at current densities of 10–1000 mA‐cm −2 is , and the Tafel slope is approximately 60 mV/decade. The likely reason for this difference in rds is related to the concentration of Ni 2+ and Ni 3+ ions in and Li‐doped electrodes.